Storage Battery System and Solar Power Generation System Having the Same

ABSTRACT

A solar power generation system includes a storage battery, a solar power generation device that is provided on the side of the storage battery and outputs solar generated power, and a power control device. The power control device includes a variation component extraction unit that extracts a shade variation component from a generated power signal measured by the solar power generation device, and a smoothing unit that smoothens the shade variation component obtained by the variation component extraction unit. The power control device obtains a charge/discharge target value of the storage battery on the basis of an output signal from the smoothing unit.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a solar power generation system, andparticularly to a solar power generation system having a storage batterysystem which is suitable for minimizing a variation in solar generatedpower.

2. Background Art

In recent years, introduction of a solar power generation system hasbeen promoted due to environmental problems and the like. However,output power generated through solar power generation greatly variesdepending on the weather, and this causes a voltage variation or afrequency variation of an associated power system. As a countermeasuretherefor, a storage battery system for minimizing the variation is alsoprovided in the solar power generation system, and an output from thepower system is smoothed by charging and discharging the storage batterysystem.

JP-A-2010-22122 has proposed such a solar power generation system.JP-A-2010-22122 discloses a configuration in which effective poweroutput from a natural energy power source including solar powergeneration is detected, and a charge/discharge command value for astorage battery is obtained on the basis of a difference between thedetected effective power and a combined output value which is obtainedfor the effective power via a change-rate limiter. In addition, aprimary delay filter is provided between an effective power detector andthe change-range limiter so as to smoothen an effective power detectionvalue. Further, it is disclosed that delay operators which are connectedin series to each other are provided instead of the primary delayfilter, items of effective power obtained during a plurality of samplingcycles are added together, an average value thereof is obtained and isinput to the change-rate limiter, and thus even in a case where anoutput of the natural energy power source periodically varies in a spikeshape, this case is handled by reducing the capacity of the storagebattery.

SUMMARY OF THE INVENTION

However, in JP-A-2010-22122, a combined output target value iscalculated by obtaining a moving average of effective power from thenatural energy power source by using the primary delay filter or aplurality of delay operators which are connected in series to eachother. Thus, there is a deviation between the obtained combined outputtarget value and a measured effective power profile of the naturalenergy power source. Charging or discharging of the storage battery isrequired to be performed depending on a deviation amount, and, as aresult, the capacity of the storage battery is required to be secured bythe deviation amount. Therefore, in the configuration disclosed inJP-A-2010-22122, there is a limitation in reduction of the capacity ofthe storage battery.

Therefore, an object of the present invention is to provide a storagebattery system which can maintain performance of minimizing a solargenerated power variation and reduce storage battery capacity, and asolar power generation system having the storage battery system.

In order to solve the above-described problems, according to an aspectof the present invention, there is provided a solar power generationsystem including (1) a storage battery; (2) a solar power generationdevice that is provided on the side of the storage battery and outputssolar generated power; and (3) a power control device. The power controldevice includes a variation component extraction unit that extracts ashade variation component from a generated power signal measured by thesolar power generation device; and a smoothing unit that smoothens theshade variation component obtained by the variation component extractionunit. In addition, the power control device obtains a charge/dischargetarget value of the storage battery on the basis of an output signalfrom the smoothing unit.

According to another aspect of the present invention, there is provideda storage battery system including (1) a storage battery that performscharging and discharging with solar generated power output from a solarpower generation device; and (2) a power control device. The powercontrol device includes a variation component extraction unit thatextracts a shade variation component from a generated power signalmeasured by the solar power generation device; and a smoothing unit thatsmoothens the shade variation component obtained by the variationcomponent extraction unit. In addition the power control device obtainsa charge/discharge target value of the storage battery on the basis ofan output signal from the smoothing unit.

According to still another aspect of the present invention, there isprovided a power control device including a variation componentextraction unit that extracts a shade variation component from agenerated power signal measured by the solar power generation device; asmoothing unit that smoothens the shade variation component obtained bythe variation component extraction unit; and a calculation unit thatobtains a charge/discharge target value of the storage battery on thebasis of an output signal from the smoothing unit.

According to the present invention, it is possible to provide a storagebattery system which can maintain performance of minimizing a solargenerated power variation and reduce storage battery capacity, and asolar power generation system having the storage battery system.

For example, a difference between power generated through solar powergeneration and a system output power target value including compensationperformed by the storage battery is reduced, and thus it is possible tofurther reduce storage battery capacity while maintaining theperformance of minimizing a variation in the solar generated power.

Objects, configurations, and effects other than the above descriptionwill become apparent through description of the following embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram schematically illustrating the entire configurationof a solar power generation system of Example 1 as one Example of thepresent invention.

FIG. 2 is a functional block diagram of a general controller illustratedin FIG. 1.

FIG. 3 illustrates a temporal change of each power signal in the generalcontroller illustrated in FIG. 2.

FIG. 4 is a diagram illustrating a standard generated power profileobtained by a standard generated power calculation unit illustrated inFIG. 2.

FIG. 5 is a diagram illustrating an insolation amount profile.

FIG. 6 is a diagram illustrating a screen display example of a terminalillustrated in FIG. 1.

FIG. 7 is a flowchart illustrating processes performed by the generalcontroller illustrated in FIG. 2.

FIG. 8 illustrates a temporal change of each power signal in a generalcontroller of Example 2 as another Example of the present invention.

FIG. 9 illustrates temporal changes of a generated power monitoringsignal and standard generated power in Example 2 and a comparativeexample.

FIG. 10 is a functional block diagram illustrating a general controllerof Example 3 as still another Example of the present invention.

FIG. 11 is a flowchart illustrating processes performed by the generalcontroller illustrated in FIG. 10.

FIG. 12 illustrates temporal changes of a generated power monitoringsignal and a system output power target value, and a relationshipbetween the system output power target value, discharge adjustmentpower, and an SOC in Example 3.

FIG. 13 is a diagram illustrating a standard generated power profileobtained by a standard generated power calculation unit of Example 4 asstill another Example of the present invention.

FIG. 14 is a diagram illustrating a standard generated power profileobtained by a standard generated power calculation unit of Example 5 asstill another Example of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In the present specification, “standard generated power P_(REF)”indicates generated power which is obtained by a solar power generationdevice in fine weather. In addition, a “solar panel” indicates a solarpower generation device which is formed of a plurality of solar cellsand outputs solar generated power.

Hereinafter, Examples of the present invention will be described withreference to the drawings.

Example 1

FIG. 1 is a diagram schematically illustrating the entire configurationof a solar power generation system of Example 1 as one Example of thepresent invention. A solar power generation system 1 includes a solarpanel 4 and a storage battery system 2. The storage battery system 2includes a storage battery 7, a storage battery power conditioner (powerconditioning system (PCS)) 6 (hereinafter, referred to as a storagebattery PCS 6), a solar power conditioner (PCS) 5 (hereinafter, referredto as a solar PCS), and a power control device 3. The power controldevice 3 includes a general controller 9, an insolation meter 10, anexternal controller 11 which can perform communication with the generalcontroller 9 via a network 8 such as the Internet, and a terminal 12which is connected to the external controller 11 via a serial bus or aparallel bus. The solar power generation system 1 can be easilyconfigured by connecting the storage battery system 2 to an existing ora new solar panel 4 via power lines. In addition, the solar powergeneration system 1 can be easily configured by connecting the powercontrol device 3 to an equipment including the existing solar panel 4,the storage battery 7, the solar PCS 5, and the storage battery PCS 6via signal lines.

The solar panel 4 generates power by using sunlight, and solar generatedpower P_(PV) is converted from DC power into AC power via the solar PCS5 constituting the storage battery system 2 and is supplied to a powersystem 13. The storage battery 7 performs charging and discharging onthe power system 13 with charge/discharge power P_(BATT) via the storagebattery PCS 6. As a result, a total system output P_(SYS) for the powersystem 13 is a combined output of the solar generated power P_(PV) andthe charge/discharge power P_(BATT), and thus a variation in the solargenerated power P_(PV) due to a shade variation component such as acloud is canceled (compensated) by the charge/discharge power P_(BATT)so that the system output P_(SYS) is smoothened. In other words, thestorage battery system 2 has a function of minimizing a variation in thesolar generated power P_(PV). Here, the solar panel 4 has aconfiguration in which, for example, a plurality of solar cells based onsilicon of the monocrystalline silicon type, the polycrystalline silicontype, the microcrystalline silicon type, or the amorphous silicon type,or based on a compound such as InGaAs, GaAs, or CuInS₂ (CIS) areconnected in series and parallel to each other. The organic solar panel4 using a dye sensitized solar cell or an organic thin film solar cellmay be employed. The power conditioner (PCS) is referred to as a systeminterconnection inverter in some cases. The solar generated power P_(PV)from the solar panel 4 is limited by the capacity of the solar PCS 5 viathe solar PCS 5. For example, in a case where the solar generated powerP_(PV) from the solar panel 4 is 4.2 kW, and the capacity of the solarPCS 5 is 4.0 kW, the solar generated power P_(PV) is limited to 4.0 kWvia the solar PCS 5.

The general controller 9 constituting the power control device 3, aswill be described later, calculates a system output power target valueP_(SYS)* which is used as a reference for minimizing a variation,obtains a charge/discharge target value P_(b)* on the basis of theobtained system output power target value P_(SYS)*, and outputs thevalue to the storage battery PCS 6. The general controller 9 isconfigured to acquire a generated power monitoring signal P_(PV) _(_)_(FB) which is a monitoring signal of the solar generated power P_(PV)measured by the solar PCS 5, an insolation amount H measured by theinsolation meter 10, and a state of charge (SOC) of the storage battery7. The general controller 9 has a function of setting a solar generatedpower upper limit value P_(PV) _(_) _(lim) which is an upper limit valueof the solar generated power P_(PV) in the solar PCS 5. In FIG. 1, eachof the solar PCS 5 and the storage battery PCS 6 is provided alone, butthe present invention is not limited thereto. For example, a large-scalesolar power generation system 1 such as a mega-solar system including aplurality of solar panels 4 may have a configuration in which aplurality of solar PCSs 5 are provided in accordance with the pluralityof solar panels 4, and a plurality of storage battery PCSs 6 areprovided in accordance with a plurality of storage batteries 7. In thiscase, the general controller 9 calculates a sum value of the pluralityof solar PCSs 5 as the system output power target value P_(SYS)*.Similarly, the general controller 9 calculates a sum value of theplurality of storage battery PCSs 6 as the charge/discharge target valueP_(b)*. The generated power monitoring signal P_(PV) _(_) _(FB) may bemeasured by a power system or the like which is separately provided inthe solar PCS 5.

Next, a description will be made of a configuration of the generalcontroller 9. FIG. 2 is a functional block diagram of the generalcontroller 9. The general controller 9 includes a clocking unit 901, asunrise detection unit 902, a standard generated power calculation unit903, a first upper/lower limit limiter 904, a normalization unit 905, asmoothing unit 906, a recovery unit 907, a subtractor 908, a secondupper/lower limit limiter 909, a solar PCS power upper limit settingunit 910, a culmination time setting unit 911, and a solar outputcorrection unit 913. Each of the standard generated power calculationunit 903, and the solar output correction unit 913 is constituted of,for example, a processor such as a CPU (not illustrated), and a storageportion such as a ROM and a RAM. The ROM stores a program forcalculating standard generated power, and a program for solar outputcorrection. The RAM temporarily stores data which is being calculated bythe processor or data used for calculation.

As illustrated in FIG. 2, the generated power monitoring signal P_(PV)_(_) _(FB) measured by the solar PCS 5 branches so as to be input to thesunrise detection unit 902, the normalization unit 905, and thesubtractor 908. A time point t measured by the clocking unit 901 isinput to the sunrise detection unit 902 and the standard generated powercalculation unit 903. The standard generated power calculation unit 903acquires a sunrise time T_(R) from the sunrise detection unit 902, and aculmination time T_(N) at which the sun is located at the culminationaltitude from the culmination time setting unit 911. The standardgenerated power calculation unit 903 acquires the insolation amount Hfrom the insolation meter 10. Here, the sunrise detection unit 902outputs a time point which is stored in advance in a preset storageportion (not illustrated) to the standard generated power calculationunit 903 as the sunrise time T_(R). Instead of the above-describedconfiguration, the sunrise detection unit 902 may be configured tomonitor the generated power monitoring signal P_(PV) _(_) _(FB) measuredby the solar PCS 5, and to obtain the sunrise time T_(R) with a changefrom rising of the generated power monitoring signal P_(PV) _(_) _(FB)before dawn, that is, from a zero value to predetermined positive poweras a trigger. The culmination time setting unit 911 stores a time pointcorresponding to the preset culmination time T_(N) in a storage portion(not illustrated), reads the culmination time T_(N) from the storageportion, and outputs the culmination time T_(N) to the standardgenerated power calculation unit 903. Alternatively, the culminationtime setting unit 911 may be configured to obtain the culmination timeT_(N) through calculation on the basis of input latitude and longitudeinformation of an installation location of the solar panel 4.

The standard generated power calculation unit 903 calculates thestandard generated power P_(REF) on the basis of the time point tacquired from the clocking unit 901, the culmination time T_(N) obtainedfrom the culmination time setting unit 911, and the sunrise time T_(R)obtained from the sunrise detection unit 902. The calculated standardgenerated power P_(REF) is limited in an upper limit value and a lowerlimit value thereof by the first upper/lower limit limiter 904 which isprovided on the subsequent stage of the standard generated powercalculation unit 903. Here, the upper limit value and the lower limitvalue are set by the solar PCS power upper limit value setting unit 910in a solar PCS power upper limit value P_(pvLIM) as the upper limitvalue and a zero value as the lower limit value in the first upper/lowerlimit limiter 904. Here, the solar PCS power upper limit value P_(pvLIM)is set depending on the capacity of the solar PCS 5 as described above.

A description will be made of an example in which the standard generatedpower calculation unit 903 calculates the standard generated powerP_(REF). FIG. 4 is a diagram illustrating a standard generated powerprofile obtained by the standard generated power calculation unit 903.The standard generated power P_(REF) is calculated as a curve in which24-hour cyclic components of the solar generated power P_(PV) of thatday are substantially drawn, that is, a standard generated powerprofile. For example, a method is known in which a solar powergeneration curve obtained on the basis of insolation in fine weather isdefined by a trigonometric function. The standard generated powercalculation unit 903 calculates the following Equation (1), and adds anoffset signal P_(offset) for preventing division by zero to thecalculation result so as to obtain the standard generated power P_(REF),that is, the standard generated power profile.

$\begin{matrix}{{P_{REF}(t)} = {{X \cdot 10^{- \frac{Y}{\cos \mspace{11mu} \theta \mspace{11mu} {(t)}}}} + P_{offset}}} & (1)\end{matrix}$

Here, T_(R)≦t≦T_(F), and X, and Y are parameters which are arbitrarilyset by an operator. The parameter X is a parameter contributing to anamplitude value (gain) of the standard generated power P_(REF), and theparameter Y is a parameter contributing to a definition of duration Wbetween the sunrise time T_(R) and the sunset time T_(F). The parameterY partially contributes to a definition of the amplitude value. In otherwords, rising of the standard generated power profile at the sunrisetime T_(R) and falling of the standard generated power profile at thesunset time T_(F) are set to be rapid or smooth according to a set valueof the parameter Y. An angle θ in FIG. 4 indicates an angle of sunlightwhich is incident to the installed solar panel 4, that is, an angle ofthe sun. Therefore, θ in Equation (1) is set to −90° at the sunrise timeT_(R) and to +90° at the sunset time T_(F), and the amplitude value atthe culmination time T_(N) is the maximum (H).

FIG. 5 illustrates an insolation amount profile. As illustrated in FIG.5, the insolation amount H measured by the insolation meter 10 exhibitsan insolation amount profile to which an oscillation component with alarge amplitude is added. This depends on cloud movements correspondingto a weather state, and indicates a profile which rapidly changes everyhour in a day (24-hour cycle). In the example illustrated in FIG. 5,cloud movements are large, especially in the morning and thus theinsolation amount H greatly varies. A change in solar generated power ina relatively long cycle such as being a bit cloudy may be defined bychanging the parameters X and Y according to the intensity of theinsolation amount H obtained from the insolation meter 10. The standardgenerated power calculation unit 903 may be configured to correct thestandard generated power P_(REF) on the basis of the insolation amountprofile illustrated in FIG. 5.

Referring to FIG. 2 again, the normalization unit 905 calculates a shadevariation component S_(in) by dividing the generated power monitoringsignal P_(PV) _(_) _(FB) input from the solar PCS 5 by the standardgenerated power P_(REF) which is calculated by the standard generatedpower calculation unit 903 and is obtained via the first upper/lowerlimit limiter 904, and outputs the shade variation component S_(in) tothe smoothing unit 906. In other words, the shade variation componentS_(in) is obtained as follows.

Shade variation component S_(in)=(generated power monitoring signalP_(PV) _(_) _(FB))/(standard generated power P_(REF))

The normalization unit 905 is constituted of a divider.

The smoothing unit 906 performs a smoothing process on the shadevariation component S_(in) input from the normalization unit 905 so asto calculate a smoothened shade variation component S_(out) which isthen output to the recovery unit 907. Here, the smoothing unit 906 isimplemented by, for example, a moving average calculation type in whicha moving average is calculated by a primary delay filter or a pluralityof delay operators which are connected in series to each other, or isimplemented by a low-pass filter.

The recovery unit 907 obtains the system output power target valueP_(SYS)* by multiplying the smoothened shade variation component S_(out)input from the smoothing unit 906 by the standard generated powerP_(REF) which is calculated by the standard generated power calculationunit 903 and is obtained via the first upper/lower limit limiter 904,and outputs the value to the subtractor 908. In other words, the systemoutput power target value P_(SYS)* is obtained as follows.

System output power target value P_(SYS)*=smoothened shade variationcomponent S_(out)×standard generated power P_(REF)

As mentioned above, in the present example, the general controller 9extracts the shade variation component S_(in) which is a variationfactor of the solar generated power P_(PV) on the basis of the generatedpower monitoring signal P_(PV) _(_) _(FB) and the standard generatedpower P_(REF), and smoothens the extracted shade variation componentS_(in). The general controller 9 obtains the system output power targetvalue P_(SYS)* on the basis of the smoothened shade variation componentS_(out) after being smoothened and the standard generated power P_(REF),and can thus obtain the system output power target value P_(SYS)* byreflecting the shade variation component S_(in) therein.

The subtractor 908 subtracts the system output power target valueP_(SYS)* which is output from the recovery unit 907 from the generatedpower monitoring signal P_(PV) _(_) _(FB) which is input from the solarPCS 5, so as to obtain the charge/discharge target value P_(b)*. Anupper limit value and a lower limit value of the charge/discharge targetvalue P_(b)* are limited in the second upper/lower limit limiter 909which is provided in the subsequent stage of the subtractor 908. Here, astorage battery PCS power upper limit value +P_(bLIM) and a storagebattery PCS power lower limit value −P_(bLIM) which are set in thesecond upper/lower limit limiter 909 are set to, for example, valuescorresponding to limit power of charging or discharging of the storagebattery 7 or the storage battery PCS 6. The charge/discharge targetvalue P_(b)* whose upper limit value and lower limit value are limitedin the second upper/lower limit limiter 909 is output to the storagebattery PCS 6.

The solar output correction unit 913 acquires a state of charge (SOC)from the storage battery 7 and also acquires the charge/discharge targetvalue P_(b)* output from the subtractor 908. At this time, in a casewhere a variation in the system output P_(SYS) illustrated in FIG. 1 ishard to sufficiently minimize, such as a case where the state of charge(SOC) of the storage battery 7 is reduced, the solar output correctionunit 913 reduces the upper limit value P_(PV) _(_) _(lim) of the solargenerated power P_(PV) in advance, and outputs the reduced upper limitvalue P_(PV) _(_) _(lim) to the solar PCS 5.

The above-described solar PCS power upper limit setting unit 910 may seta value which is conjunct with a variation in the upper limit valueP_(PV) _(_) _(lim) of the solar generated power P_(PV) in the solaroutput correction unit 913, as the solar PCS power upper limit valueP_(pvLIM) in the first upper/lower limit limiter 904.

Here, FIG. 3 illustrates a temporal change of each power signal in thegeneral controller 9 illustrated in FIG. 2. On an upper part of FIG. 3,a temporal change of the generated power monitoring signal P_(PV) _(_)_(FB) input from the solar PCS 5 is indicated by a solid line, and atemporal change of the standard generated power P_(REF) which iscalculated by the standard generated power calculation unit 903 and isobtained via the first upper/lower limit limiter 904 is indicated by adotted line. On an intermediate part thereof, a temporal change of theshade variation component Si, output from the normalization unit 905 isindicated by a solid line, and a temporal change of the smoothened shadevariation component S_(out) output from the smoothing unit 906 isindicated by a dotted line. On a lower part thereof, a temporal changeof the system output power target value P_(SYS)* output from therecovery unit 907 is indicated by a thick dotted line, and a temporalchange of the standard generated power P_(REF) which is calculated bythe standard generated power calculation unit 903 and is obtained viathe first upper/lower limit limiter 904 is indicated by a dotted line.As illustrated on the upper part of FIG. 3, a variation in the generatedpower monitoring signal P_(PV) _(_) _(FB) exhibits a waveform in which ashade variation component for a short period of time is superimposed ona large variation component in a 24-hour cycle, that is, during themorning, the afternoon, and the night. It can be seen that the shadevariation component S_(in) obtained by the normalization unit 905 islocated around 1.0 for most of the time as illustrated on theintermediate part of FIG. 3, and thus only the shade variation componentis extracted by removing the variation component in the 24-hour cycle.It can be seen that the smoothing unit 906 performs the above-describedsmoothing process on only the shade variation component S_(in) obtainedin the above-described way, and thus the system output power targetvalue P_(SYS)* which is not delayed relative to the variation componentin the 24-hour cycle is obtained by the recovery unit 907 as illustratedon the lower part of FIG. 3.

FIG. 6 is a diagram illustrating a screen display example of theterminal 12 illustrated in FIG. 1. As illustrated in FIG. 6, a screen 20of a display device of the terminal 12 includes a first display region21, a second display region 22, a parameter input region 23, a historydesignation input region 24, a history display type designation inputregion 25, and an execution button 26.

As illustrated in FIG. 6, a system diagram of the solar power generationsystem is displayed on the second display region 22. In the exampleillustrated in FIG. 6, in the displayed system diagram, the solargenerated power P_(PV) is supplied to the power system by a mega-solarsystem (large-scale solar power generation system) including a pluralityof solar panels, a plurality of solar PCSs, a plurality of storagebatteries, a plurality of storage battery PCSs, and general controllers(Cont) provided at the respective solar panels, and a solar powergeneration system connected to the mega-solar system via a network.

The history display type designation input region 25 is a region whichallows an operator's designation on the type whose history is to bedisplayed in the first display region 21, to be input. In the exampleillustrated in FIG. 6, a state is displayed in which “generated powerresult history” and “insolation profile history” are displayed as thetype, and the “generated power result history” is designated by theoperator.

The history designation input region 24 is a region which allows theoperator to select and designate a desired period among the present andpast results displayed in the first display region 21 in relation to thetype designated in the history display type designation input region 25.Pull-down buttons are provided on a right column of the historydesignation input region 24. The operator can designate a desired periodby using the pull-down buttons. A blank column is provided among optionsusing the pull-down button, and the operator may input a desired periodfor himself/herself with an input device such as a keyboard or a mouse(not illustrated) after designating the blank column. In the exampleillustrated in FIG. 6, a state is illustrated in which “the present”,“one year ago”, and “two years ago” are designated. A period in whichdesignated history is to be displayed is not limited to the designationof every year, and may be, for example, “the present”, “yesterday”, and“the day before yesterday”. However, regarding designation of seasons,the insolation amount H greatly differs for each season, and thus aperiod in the same season is preferably designated.

As described above, if the “generated power result history” isdesignated in the history display type designation input region 25, and“the present”, “one year ago”, and “two years ago” are designated in thehistory designation input region 24, a profile of a solar generatedpower result corresponding to each item is displayed in the firstdisplay region 21 so as to be referred to. Consequently, the operatorcan set the parameters X and Y in the above Equation (1) to desiredvalues by referring to the system diagram of the solar power generationsystem displayed in the second display region 22 and the solar generatedpower profiles corresponding to “the present”, “one year ago”, and “twoyears ago” displayed in the first display region 21. The parameters Xand Y are set by using the parameter input region 23. In the same manneras the history designation input region 24, pull-down buttons areprovided on the right column of the parameter input region 23. Theoperator selects and designates desired values among a plurality ofvalues which are prepared as options in advance by using the pull-downbuttons. A blank column may be provided among the options, and a desiredvalue may be input by the operator by designating the blank column. FIG.6 illustrates a state in which “abc” is set as the parameter X, and“efg” is set as the parameter Y. If the operator's input operation onthe execution button 26 is received in this state, the terminal 12transmits the set parameters X and Y to the general controller 9 via theexternal controller 11 and the network 8. If the parameters X and Y arereceived via a communication interface (not illustrated), the generalcontroller 9 stores the parameters in a storage portion (notillustrated) of the standard generated power calculation unit 903, andperforms calculation according to the above Equation (1) by using thestored parameters X and Y so as to calculate the standard generatedpower P_(REF) as described above. A storage portion storing theparameters X and Y is not limited to the storage portion in the standardgenerated power calculation unit 903, and may be an external storageportion. A case where the “generated power result history” is designatedhas been described as an example in FIG. 6, but, similarly, also in acase where the “insolation profile history” is designated, theinsolation profile history is displayed in the first display region 21.The history display type designation input region 25 may allow both ofthe “generated power result history” and the “insolation profilehistory” to be designated. In this case, both of the generated powerresult history and the insolation profile history are displayed in thefirst display region 21.

Next, a description will be made of a flow of a series of processesperformed by the general controller 9. FIG. 7 is a flowchartillustrating processes performed by the general controller 9.

The standard generated power calculation unit 903 constituting thegeneral controller 9 acquires the insolation amount H, the culminationtime T_(N), the sunrise time T_(R), and the generated power monitoringsignal P_(PV) _(_) _(FB) (step S10). The standard generated powercalculation unit 903 calculates the standard generated power P_(REF) byusing the above Equation (1) (step S11). In step S12, the solar PCSpower upper limit setting unit 910 sets the solar PCS power upper limitvalue P_(pvLIM) in the first upper/lower limit limiter 904.

In step S13, the normalization unit 905 divides the generated powermonitoring signal P_(PV) _(_) _(FB) by the standard generated powerP_(REF) which is obtained via the first upper/lower limit limiter 904,so as to extract the shade variation component S_(in). In step S14, thesmoothing unit 906 performs a smoothing process on the shade variationcomponent Si, obtained in step S13, so as to calculate the smoothenedshade variation component S_(out).

In step S15, the recovery unit 907 multiplies the smoothened shadevariation component S_(out) obtained in step S14 by the standardgenerated power P_(REF) obtained via the first upper/lower limit limiter904, so as to calculate the system output power target value P_(SYS)*.Next, a difference between the generated power monitoring signal P_(PV)_(_) _(FB) and the system output power target value P_(SYS)* calculatedin step S15 is calculated (step S16). The difference calculated in stepS16 passes through the second upper/lower limit limiter 909 so that thecharge/discharge target value P_(b)* is calculated (step S17), and theprocess is finished. A control cycle in the general controller 9 has,for example, the order of several seconds, and the processes from stepS10 to step S17 are performed at this control cycle.

In the present example, the terminal 12 is connected to the externalcontroller 11 which is connected to the general controller 9 via thenetwork 8, but the present invention is not limited thereto, and theterminal 12 may be connected to the general controller 9 via a serialbus or a parallel bus.

As described above, according to the present example, a shade variationcomponent is extracted, and a smoothing process (a primary delay filteror the like) is performed on only the extracted shade variationcomponent. Thus, it is possible to reduce a difference between thestandard generated power P_(REF) and the system output power targetvalue P_(SYS)*. Consequently, the charge/discharge target value P_(b)*for the storage battery is optimized, and thus it is possible to reducestorage battery capacity while maintaining the performance of minimizinga variation in the solar generated power P_(PV).

Example 2

FIG. 8 illustrates a temporal change of each power signal in a generalcontroller of Example 2 as another Example of the present invention. Thepresent example is different from Example 1 in that the solar PCS 5whose rating output is designed to be lower than the maximum power ofthe solar panel 4 is used. Other configurations are the same as those inthe above Example 1, and description overlapping that in Example 1 willnot be repeated.

On an upper part of FIG. 8, a temporal change of the generated powermonitoring signal P_(PV) _(_) _(FB) input from the solar PCS 5 isindicated by a solid line, and a temporal change of the standardgenerated power P_(REF) which is calculated by the standard generatedpower calculation unit 903 (FIG. 2) and is obtained via the firstupper/lower limit limiter 904 (FIG. 2) is indicated by a dotted line. Onan intermediate part thereof, a temporal change of the shade variationcomponent Si, output from the normalization unit 905 (FIG. 2) isindicated by a solid line, and a temporal change of the smoothened shadevariation component S_(out) output from the smoothing unit 906 (FIG. 2)is indicated by a dotted line. On a lower part thereof, a temporalchange of the system output power target value P_(SYS)* output from therecovery unit 907 (FIG. 2) is indicated by a thick dotted line, and atemporal change of the standard generated power P_(REF) which iscalculated by the standard generated power calculation unit 903 and isobtained via the first upper/lower limit limiter 904 is indicated by adotted line.

The solar PCS 5 of the present example is designated to have ratingpower lower than the maximum power of the solar panel 4. Therefore, asillustrated on the upper part of FIG. 8, the generated power monitoringsignal P_(PV) _(_) _(FB) which is a monitoring signal of the solargenerated power P_(PV) measured by the solar PCS 5 tends to have aprofile whose top is flat since a peak of the solar generated powerP_(PV) is cut. The solar PCS power upper limit setting unit 910 sets thesolar PCS power upper limit value P_(pVLIM) corresponding to the ratingpower of the solar PCS 5 in the first upper/lower limit limiter 904.Consequently, the standard generated power P_(REF) calculated by thestandard generated power calculation unit 903 is limited by the firstupper/lower limit limiter 904. A profile of the standard generated powerP_(REF) having passed through the first upper/lower limit limiter 904becomes a profile whose top is flat in the same manner as in thegenerated power monitoring signal P_(PV) _(_) _(FB) as illustrated onthe upper part of FIG. 8.

In profiles of the shade variation component S_(in) obtained by thenormalization unit 905 and the smoothened shade variation componentS_(out) obtained by the smoothing unit 906, in the same manner as inExample 1 (FIG. 3), only a shade variation component is extracted byremoving a variation component in the 24-hour cycle as illustrated onthe intermediate part of FIG. 8. As mentioned above, the smoothing unit906 performs the smoothing process described in Example 1 on only theshade variation component S_(in), and thus the system output powertarget value P_(SYS)* which is not delayed relative to the variationcomponent in the 24-hour cycle is obtained as illustrated on the lowerpart of FIG. 8. Therefore, the profile of the system output power targetvalue P_(SYS)* also becomes a profile whose top is flat.

Here, FIG. 9 illustrates temporal changes of a generated powermonitoring signal and standard generated power in the present exampleand a comparative example. A configuration of the comparative example isthe same as the configuration disclosed in JP-A-2010-22122. An upperpart of FIG. 9 illustrates the profiles of the generated powermonitoring signal P_(PV) _(_) _(FB) and the standard generated power PREillustrated on the upper part of FIG. 8. A lower part of FIG. 9illustrates profiles of a combined generated power target value and thegenerated power monitoring signal P_(PV) in the comparative example,corresponding to the standard generated power P_(REF) of the presentexample.

As illustrated in FIG. 9, in the configuration of the comparativeexample, it can be seen that a deviation between the combined generatedpower target value and the generated power monitoring signal P_(PV) _(_)_(FB) increases. In other words, the combined generated power targetvalue of the comparative example has a profile in which there is a delayrelative to a variation component of the generated power monitoringsignal P_(PV) _(_) _(FB) in the 24-hour cycle. If the deviationincreases as mentioned above, this naturally influences the systemoutput power target value P_(SYS) illustrated in FIG. 8. In contrast, inthe present example, it can be seen that a deviation between thegenerated power monitoring signal P_(PV) F and the standard generatedpower P_(REF) is minimized, and thus the standard generated powerP_(REF) is obtained which is not delayed relative to the variationcomponent of the generated power monitoring signal P_(PV) _(_) _(FB) inthe 24-hour cycle.

Consequently, the deviation is reduced compared with the configurationof the comparative example. Therefore, according to the present example,it is possible to reduce an influence on the system output power targetvalue P_(SYS)*. In other words, an error component in the normalizationunit 905 is minimized and thus unnecessary charge and discharge in thestorage battery 7 are reduced. Therefore, the capacity of the storagebattery 7 can be more considerably reduced than in the configuration ofthe comparative example. In other words, it is possible to achieve aneffect of being capable of minimizing power and a power amount of thestorage battery 7.

Example 3

FIG. 10 is a functional block diagram of a general controller of Example3 as still another Example of the present invention. The present exampleis different from Example 1 in that the general controller 9additionally includes a standard generated power correction unit 914which corrects standard generated power PRE obtained via the firstupper/lower limit limiter 904 on the basis of a state of charge (SOC)from the storage battery 7; a system output correction unit 912 whichcorrects a system output power target value P_(SYS)* output from therecovery unit 907; and a charge/discharge output correction unit 915which corrects a charge/discharge target value P_(b)* obtained from thesubtractor 908. Other configurations are the same as those in the aboveExample 1, and description overlapping that in Example 1 will not berepeated.

In FIG. 10, the standard generated power correction unit 914 correctsthe standard generated power P_(REF) which is calculated by the standardgenerated power calculation unit 903 and is obtained via the firstupper/lower limit limiter 904, on the basis of a state of charge (SOC)acquired from the storage battery 7. For example, if the acquired stateof charge (SOC) is high, the standard generated power correction unit914 corrects the parameters X and Y in the above Equation (1) so as tocorrect the standard generated power P_(REF), and thus adjusts adifference between the solar generated power P_(PV) and the systemoutput P_(SYS). Since there is a tendency for SOC likelihood to berestricted if a power amount of the storage battery 7 is minimized, thepower amount of the storage battery 7 can be reduced by controlling thestate of charge (SOC) within an appropriate range. The system outputcorrection unit 912 is disposed between the recovery unit 907 and thesubtractor 908, and adjusts the system output power target valueP_(SYS)* obtained by the recovery unit 907. The charge/discharge outputcorrection unit 915 is disposed between the subtractor 908 and thesecond upper/lower limit limiter 909, and adjusts the charge/dischargetarget value P_(b)* obtained from the subtractor 908.

Here, a description will be made of a flow of processes performed by thegeneral controller 9. FIG. 11 is a flowchart illustrating processesperformed by the general controller 9 illustrated in FIG. 10. First,steps S10 to S12 are the same as those illustrated in FIG. 7 in Example1.

In step S21, the standard generated power correction unit 914 acquiresthe standard generated power P_(REF) which has passed the firstupper/lower limit limiter 904 in which the solar PCS power upper limitvalue P_(pvLIM) is set by the solar PCS power upper limit setting unit910 in step S12. The standard generated power correction unit 914acquires a state of charge (SOC) from the storage battery 7, correctsthe standard generated power P_(REF) on the basis of the acquired SOC,and outputs the corrected standard generated power P_(REF) to thenormalization unit 905 and the recovery unit 907.

In step S13′, the normalization unit 905 divides the generated powermonitoring signal P_(PV) _(_) _(FB) measured by the solar PCS 5 by thecorrected standard generated power P_(REF) output from the standardgenerated power correction unit 914 so as to extract the shade variationcomponent S_(in). In other words, the shade variation component S_(in)is obtained as follows.

Shade variation component S _(in), =(generated power monitoring signal P_(PV) _(_) _(FB))/(corrected standard generated power P _(REF))

Steps S14 and S15 are the same as those illustrated in FIG. 7 in Example1.

In step S22, the system output correction unit 912 acquires the systemoutput power target value P_(SYS)* obtained from the recovery unit 907in step S15 and a time point t from the clocking unit 901 so as tocorrect the system output power target value P_(SYS)*, and outputs thecorrected system output power target value P_(SYS)* to the subtractor908.

In step S16′, the subtractor 908 calculates a difference between thegenerated power monitoring signal P_(PV) _(_) _(FB) and the correctedsystem output power target value P_(SYS)* by subtracting the correctedsystem output power target value P_(SYS)* from the generated powermonitoring signal P_(PV) _(_) _(FB). Next, the charge/discharge outputcorrection unit 915 receives a time point t (current time) from theclocking unit 901 and also receives the sunrise time T_(R) from thesunrise detection unit 902, so as to correct the difference, that is,the charge/discharge target value P_(b)* obtained by the subtractor 908.The charge/discharge output correction unit 915 causes the correctedcharge/discharge target value P_(b)* to pass through the secondupper/lower limit limiter 909, so as to calculate the charge/dischargetarget value P_(b)* which will be output to the storage battery PCS 6(step S17).

FIG. 12 illustrates temporal changes of the generated power monitoringsignal P_(PV) _(_) _(FB) and the system output power target valueP_(SYS)*, and a relationship between the system output power targetvalue P_(SYS), discharge adjustment power P_(D), and a state of charge(SOC). If a low-pass filter is used in the smoothing unit 906, thestorage battery 7 tends to be discharged due to an influence of a delaycomponent of the filter before and after sunset (before and after thesunset time T_(F)), and thus there is a probability that the SOC of thestorage battery 7 may be an overdischarge state at night. Since the lifeof the storage battery 7 can be lengthened when the SOC thereof ismaintained within an appropriate range, it is possible to achieve aneffect of lengthening the life of the storage battery 7 if the SOC whichis maintained to be constant can be made within an appropriate range.Therefore, for example, as indicated by a forced termination upper limitpower P_(F) _(_) _(LIM) on an upper part of FIG. 12, a ramp upper limitvalue which is 0 at a time point before the sunset time T_(F) is set,and is stored in a storage portion (not illustrated) of the systemoutput correction unit 912 in advance.

The system output correction unit 912 compares the system output powertarget value P_(SYS)* input from the recovery unit 907 with the forcedtermination upper limit power P_(F) _(_) _(LIM) stored in the storageportion (not illustrated). As a result of the comparison, if the systemoutput power target value P_(SYS) exceeds the forced termination upperlimit power P_(F) _(_) _(LIM), the system output correction unit 912corrects the system output power target value P_(SYS)* so as to matchthe forced termination upper limit power P_(F) _(_) _(LIM). As a result,the SOC of the storage battery 7 can be maintained to be high withoutreaching an overdischarge state.

In a case where there is a deviation relative to an SOC level(hereinafter, referred to as a target SOC level) in which the life ofthe storage battery 7 is further lengthened, the charge/discharge outputcorrection unit 915 corrects the charge/discharge target value P_(b)* sothat the storage battery 7 performs additional discharge by thedischarge adjustment power P_(D) illustrated in FIG. 12 at apredetermined time point after sunset (later than the sunset timeT_(F)). Consequently, an SOC level of the storage battery 7 can becaused to reach the target SOC level. In FIG. 12, the forced terminationupper limit power P_(F) _(_) _(LIM) and the discharge adjustment powerP_(D) are changed at specific change rates a_(F1), a_(F2), and a_(R2),but if the change rates are appropriately selected according to, forexample, power variation regulations of a predetermined powertransmission operating agency which manages the power system 13, it ispossible to adjust an SOC without deteriorating the performance ofminimizing a variation in the solar generated power P_(PV).

In the storage battery 7, inherently, the number of times of charge anddischarge (cycle of charge and discharge) is inversely proportional tothe storage battery life. As illustrated on the lower part of FIG. 12,the cycle of charge and discharge increases due to the storage battery 7being discharged by ΔE after a predetermined time elapsed (night) fromthe sunset time T_(F). However, the number of operations for reductionto the target SOC is only one after the sunset time T_(F) in a day.Therefore, the storage battery 7 is hardly influenced by the increase inthe cycle of charge and discharge, and rather it is possible to preventa deterioration phenomenon of the storage battery 7 occurring due to ahigh SOC state being maintained. This is considerably effective in acase where a lithium ion battery is used as the storage battery 7, andthe same effect can also be achieved in a case where other storagebatteries are used.

As described above, according to the present example, it is possible tolengthen the life of the storage battery in addition to the effects ofExample 1.

Example 4

FIG. 13 is a diagram illustrating a profile of standard generated powerP_(REF) obtained by the standard generated power calculation unit 903 ofExample 4 as still another Example of the present invention. The presentexample is different from Example 1 in that a profile in a time periodfrom the sunrise time T_(R) to the sunset time T_(F) in the standardgenerated power P_(REF) is simplified to a triangular waveform. Otherconfigurations are the same as those in Example 1 described above.Hereinafter, description overlapping that in Example 1 will be omitted.

As illustrated in FIG. 13, a profile of the standard generated powerP_(REF) output from the standard generated power calculation unit 903 isa substantially triangular profile having a peak at the culmination timeT_(N) in a time period from the sunrise time T_(R) to the sunset timeT_(F), and an offset signal P_(offset) for preventing division by zerois added thereto in the entire period of the 24-hour cycle. As mentionedabove, the profile is simplified compared with the standard generatedpower profile in Example 1, but the standard generated power profileillustrated in FIG. 13 also roughly defines a 24-hour cycle component ofthe solar generated power P_(PV). In the above-described way, thesimplified standard generated power profile is stored in a storageportion (not illustrated) of the standard generated power calculationunit 903 in advance, and is appropriately read by the standard generatedpower calculation unit 903 so as to be output to the first upper/lowerlimit limiter 904 as necessary.

From the viewpoint of the optimum extent of the charge/discharge targetvalue P_(b)* which is output to the storage battery PCS 6 and the solargenerated power upper limit value P_(PV) _(_) _(lim) which output to thesolar PCS 5, there is a probability that the optimum extent may beslightly lower than in Example 1. However, the system output powertarget value P_(SYS)* and the charge/discharge target value P_(b)* ofthe storage battery are calculated by using the shade variationcomponent S_(in) which is a variation factor of the solar generatedpower P_(PV) in addition to the standard generated power profile, andthus the entire power generation control for the solar power generationsystem is not influenced.

In the present example, the standard generated power profile has asubstantially triangular shape with a peak at the culmination timeT_(N), but is not limited thereto, and may have a polygonal waveform aslong as a peak is located at the culmination time T_(N).

According to the present example, in addition to the effects of Example1, since a configuration of the standard generated power calculationunit 903 can be simplified, a calculation load on the general controller9 can be reduced, and thus it is possible to contribute to reducing costor the like.

Example 5

FIG. 14 is a diagram illustrating a profile of standard generated powerP_(REF) obtained by the standard generated power calculation unit 903 ofExample 5 as still another Example of the present invention. The presentexample is different from Example 1 in that a profile in a time periodfrom the sunrise time T_(R) to the sunset time T_(F) in the standardgenerated power P_(REF) is simplified to a trapezoidal waveform. Otherconfigurations are the same as those in Example 1 described above.Hereinafter, description overlapping that in Example 1 will be omitted.

As illustrated in FIG. 14, a profile of the standard generated power PREoutput from the standard generated power calculation unit 903 is asubstantially trapezoidal waveform having a lower bottom between thesunrise time T_(R) and the sunset time T_(F) in a time period from thesunrise time T_(R) to the sunset time T_(F), and an offset signalP_(offset) for preventing division by zero is added thereto in theentire period of the 24-hour cycle. Here, in the substantiallytrapezoidal profile, power change rates in a period after predeterminedtime elapses from the sunrise time T_(R) and in a period earlier thanthe sunset time T_(F) by a predetermined time are, for example, changerates a_(R) and a_(F). If the change rates a_(R) and a_(F) areappropriately selected according to, for example, power variationregulations of a predetermined power transmission operating agency whichmanages the power system 13, it is possible to prevent deterioration ofthe performance of minimizing a variation in the solar generated powerP_(PV).

In the above-described way, the standard generated power profileillustrated in FIG. 14 is stored in a storage portion (not illustrated)of the standard generated power calculation unit 903 in advance, and isappropriately read by the standard generated power calculation unit 903so as to be output to the first upper/lower limit limiter 904 asnecessary.

For example, a large-scale solar power generation system 1 such as amega-solar system including a plurality of solar panels 4, there is acase where system design for reducing the number of solar PCSs 5 to beinstalled is carried out in order to reduce equipment investment for thePCSs. In this case, the substantially trapezoidal standard generatedpower profile illustrated in FIG. 14 has the upper bottom which is flatduring a predetermined time period between the sunrise time T_(R) andthe sunset time T_(F). The upper bottom of the standard generated powerprofile has a function of cutting a peak of the solar generated powerP_(PV) which is proportional to the insolation amount H. Consequently,it is possible to reduce the number of solar PCSs 5 to be installed.

According to the present example, it is possible to reduce the number ofsolar PCSs 5 to be installed in addition to the effects of Example 4.

The present invention is not limited to the above-described Examples andincludes various modifications. For example, the above Examples havebeen described in detail for better understanding of the presentinvention, and are not necessarily limited to including all theconfigurations described above. Some configurations of certain Examplemay be replaced with configurations of other Examples, and theconfigurations of other Examples may be added to the configuration ofcertain Example. The configurations of other Examples may be added to,deleted from, and replaced with some of the configurations of eachExample.

What is claimed is:
 1. A solar power generation system comprising: astorage battery; a solar power generation device that is provided on theside of the storage battery and outputs solar generated power; and apower control device, wherein the power control device includes avariation component extraction unit that extracts a shade variationcomponent from a generated power signal measured by the solar powergeneration device; and a smoothing unit that smoothens the shadevariation component obtained by the variation component extraction unit,and wherein the power control device obtains a charge/discharge targetvalue of the storage battery on the basis of an output signal from thesmoothing unit.
 2. The solar power generation system according to claim1, wherein the power control device further includes a terminal providedwith an insolation meter measuring an insolation amount and a displayunit, wherein generated power output results of the solar powergeneration device and/or history of the insolation amount are/isdisplayed on a display screen of the terminal.
 3. The solar powergeneration system according to claim 2, wherein the power control devicefurther includes a standard generated power calculation unit thatobtains generated power obtained by the solar power generation device infine weather as standard generated power, and wherein the variationcomponent extraction unit extracts the shade variation component on thebasis of the generated power signal and the standard generated power. 4.The solar power generation system according to claim 3, wherein thedisplay unit of the terminal includes a first display region thatdisplays the generated power output results of the solar powergeneration device and/or the history of the insolation amount; a seconddisplay region that displays a system diagram of the solar powergeneration system; and a third display region that receives inputting ofa parameter for defining the standard generated power.
 5. The solarpower generation system according to claim 4, wherein the display unitof the terminal further includes a fourth display region that allows atime period of the generated power output results of the solar powergeneration device and/or the history of the insolation amount to bedisplayed in the first display region, to be designated and be input. 6.The solar power generation system according to claim 1, wherein thepower control device further includes a standard generated powercalculation unit that obtains generated power obtained by the solarpower generation device in fine weather as standard generated power; anda recovery unit that multiplies the standard generated power and theoutput signal from the smoothing unit so as to obtain a system outputpower target value corresponding to total output power obtained by thesolar power generation device and the storage battery, wherein thevariation component extraction unit extracts the shade variationcomponent on the basis of the generated power signal and the standardgenerated power, and wherein a charge/discharge target value of thestorage battery is obtained by using a difference between the generatedpower signal and the system output power target value.
 7. A storagebattery system comprising: a storage battery that performs charging anddischarging with solar generated power output from a solar powergeneration device; and a power control device, wherein the power controldevice includes a variation component extraction unit that extracts ashade variation component from a generated power signal measured by thesolar power generation device; and a smoothing unit that smoothens theshade variation component obtained by the variation component extractionunit, and wherein the power control device obtains a charge/dischargetarget value of the storage battery on the basis of an output signalfrom the smoothing unit.
 8. The storage battery system according toclaim 7, wherein the power control device further includes a standardgenerated power calculation unit that obtains generated power obtainedby the solar power generation device in fine weather as standardgenerated power, and wherein the variation component extraction unitextracts the shade variation component on the basis of the generatedpower signal and the standard generated power.
 9. The storage batterysystem according to claim 8, wherein the power control device furtherincludes a terminal provided with an insolation meter measuring aninsolation amount and a display unit, wherein generated power outputresults of the solar power generation device and/or history of theinsolation amount are/is displayed on a display screen of the terminal.10. The storage battery system according to claim 9, wherein the displayunit of the terminal includes a first display region that displays thegenerated power output results of the solar power generation deviceand/or the history of the insolation amount; a second display regionthat displays a system diagram of the solar power generation system; anda third display region that receives inputting of a parameter fordefining the standard generated power.
 11. The storage battery systemaccording to claim 8, wherein the power control device further includesa recovery unit that multiplies the standard generated power and theoutput signal from the smoothing unit so as to obtain a system outputpower target value corresponding to total output power obtained by thesolar power generation device and the storage battery, and wherein acharge/discharge target value of the storage battery is obtained byusing a difference between the generated power signal and the systemoutput power target value.
 12. A power control device comprising: avariation component extraction unit that extracts a shade variationcomponent from a generated power signal measured by the solar powergeneration device; a smoothing unit that smoothens the shade variationcomponent obtained by the variation component extraction unit; and acalculation unit that obtains a charge/discharge target value of thestorage battery on the basis of an output signal from the smoothingunit.
 13. The power control device according to claim 12, furthercomprising: a standard generated power calculation unit that obtainsgenerated power obtained by the solar power generation device in fineweather as standard generated power, and wherein the variation componentextraction unit extracts the shade variation component on the basis ofthe generated power signal and the standard generated power.
 14. Thepower control device according to claim 13, further comprising: aterminal provided with an insolation meter measuring an insolationamount and a display unit, wherein generated power output results of thesolar power generation device and/or history of the insolation amountare/is displayed on a display screen of the terminal.
 15. The powercontrol device according to claim 13, further comprising: a recoveryunit that multiplies the standard generated power and the output signalfrom the smoothing unit so as to obtain a system output power targetvalue corresponding to total output power obtained by the solar powergeneration device and the storage battery, and wherein acharge/discharge target value of the storage battery is obtained byusing a difference between the generated power signal and the systemoutput power target value.